Safety-plug for boilers.



1. A. RICARD. SAFETY PLUG FOR BOILERS. APPLICATION FILED DEC.6, 1914.

Patented Nov. 9, 1915.

- flg. Witnesses: Irwenlor: @/C AWM E JosephJ/llcard, MM @im y I M' Aug.

COLUMBIA PLANDURAPH co., WASHINGTON. D. c,

JOSEPH A. RTCARD, QF BOSTON, MASSACHUSETTS.

SAFETY-PLUG FOR BOILERS.

Application led December 26, 1914.

To all whom t may concern Be it known that l, JOSEPH A. RrGAnD, a citizen of the United States of America, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful lmprovements in Safety-Plugs for Boilers, of which the following is a specication.

This invention relates to safety devices for steam boilers and the like in which a fusible plug is adapted to be blown out at a predetermined low water level and has for its object the production of a device of this character in which a new ,plug may be quickly inserted.

The invention consists of a valved outer member secured to a boiler and having threaded thereto an inner member provided with a passage normally closed at its inner end by a fusible plug and having a valve at its outer end adapted to be closed when the fuse has blown out and to remain closed until the inner member has been adjusted relatively to the outer member suliiciently to permit the closing of the valve in the outer member.

The invention further consists in certain novel features of construction and arrangement of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

0f the drawings: Figure 1 represents a plan of a device embodying the principles of the present invention.A Fig. 2 represents a longitudinal section of the same. Fig. 3 represents a plan of the same with the parts adjusted relatively to each other sufliciently to permit the closing of the valve in the outer member. Fig. 4 represents a longitudinal section of the same, and Fig. 5 renresents a perspective of the fusible nlug.

Similar characters designate like parts throughout the several figures 0f the drawings.

In the drawings, 10 is a tubular member provided at one end with an external thread 11 by which it may be secured to a boiler, the opposite end of said member being provided with an internal thread at 12 to receive the threaded portion of an inner tubular member 18. Intermediate the ends of the member 10 is a valve 1st having a. cylindrical opening 15 extending transversely thereof Specification of Letters Patent.

Serial No. 879,413.

in alinement with the anis of the bore of said member 10.

rllhe valve le is operable by means of the handle 16. The diameter of the cylindrical opening 15 in the valve 14: corresponds to that of the cylindrical portion 17 of the bore of said outer member 10. At the extreme inner end of themember 10 is a reduced cylindrical passage 18 forming a shoulder 19 as indicated in F 2 and 4 of the drawings.

.the boiler, the passage 18 communicating with the interior thereof.

Obviously the device is secured to the boiler at the eXtreme low water level. The valve 14 is in the position shown in Fig. 2 with the extension 20 extending through the opening -15 in said valve and the memberr 18 is so adjusted relatively to the outer member 10 that the fusible plugr25 will be jammed against the shoulder 19 efectually closing the outlet from the boiler. The valve 22 will be in open position at this time. As long as the water in the boiler is above the passage 18 the device will be inoperative and no leakage from the boiler will be permitted.

s soon as the water in the kboiler is lowered sufficiently to uncover the passage 18 the steam will melt the fusible plug 25 'and this plug being removed, there will be a clear passage for the escaping steam. This escaping steam will call the attention of the operator to the fact that the water in the boileri s at an unsafe level. The operator then turns the valve 21 by means of the handle 22 into the position indicated in Figs. 3 and 4C, preventing further escape of steam. The inner member 18is then turned, the threads l2 causing it to be moved longitudinally relatively to the outer member 10. This operation is continued until the extension 20 has 1atented Nov. 9, 1915.

` The inner member 13 is provided with a been removed from the opening 15 in the valve 1%, which is then closed by moving the handle 16 into the position indicated in Figs. 3 and el of the drawings. This closing of the valve 1i prevents any escape of the steam through the outer member 10 and maires it possible to entirely remove the inner member 13 and insert the shanlr 2% of a neiv fusible plug 25 into the end of the bore 23. rihe member 13 is then replaced into the outer member 10 and screwed 'therein until the fusible plug 19 reaches a point adjacent to the valve 1a, at which time the valve 21 must be in closed position. The valve lilmav then be moved into open position and the inward movement of the member' 13 continued until the neiv fusible plug 25 is forced into contact with the shoulder 19 in the outer member 10. ri"he valve Q1 ivill then be opened and the entire device Will be in condition to again indicate any unsafe condition of the ivater in the boiler that may occur.

This maires a very simple device for the purpose designed, which is simple in its operation and very eiiective in use. By such a construction as is herein shoivn the fusible plugs 25 may be reinsertedvery quickly.

rlhe many advantages of this device it is believed will be fully understood from the foregoing description.

Having thus described my invention, l claim:

1. ln a device of the class described, the combination of an outer tubular member; a valve therein the axis of Which is perpendicular to the axis of said tubular member; an inner tubular member threaded to said outer member and provided with an eXtension normally extending through a transverse opening in said valve; a fusible plug in. the inner end of said extension; and a valve in the inner tubular member.

2. ln a device of the class described, the combination of tvvo tubular members, one Within and movable relatively to the other; a va ve in each member with their axes perpendicular to the axis of said tubular members; a cylindrical extension on the inner member normally extending through a transverse opening in the valve of the outer member; and a fusible plug in the end of said extension.

3. In a device of the class described, the combination of tvvo tubular members, one Within and movable relatively to the other which is provided With an internal shoulder; a valve in each member with their axes per pendicular to the axis of said tubular members, a cylind 1ical extension on the inner member normally extending through a transverse opening in the valve of the outer Copies of this patent .may

be obtained for five cents each, by addressing the member; and a fusible plug in the end of said extension normally abutting said internal shoulder of the outer member.

el. ln a device of the class described, the combination of tivo tubular members, one threaded to the interior of the other; a fusible plug carried by the inner member and normally positioned against a shoulder in the bore ofthe outer tubular member; and a valve in each member.

5. In a device of the class described, the combination of tivo tubular members one threaded to the interior of the other which is provided With an internal shoulder; a fusible plug carried by the inner member and normally abutting said shoulder; and a valve in each member.

6. in a device of the class described, the combination of tivo tubular members, one fitted Within the other and adapted to be moved endivise relatively thereto and retained in adjusted position, the outer member having an internal shoulder; a fusible plug normally abutting said internal shoulder and having a shanlr extending into the bore of the inner member; and a valve in each member.

7. In a device of the class described, the combination of tivo tubular members, one fitted Within the other and adapted to be moved endivise relatively thereto and retained in adjusted position, the outer member having an internal shoulder; a valve in each member; a cylindrical extension to said inner member normally extending through a transverse opening in the valve of the outer member; and a fusible plug normally abutting said inner shoulder and having a shank extending into the bore of said inner member.

S. ln a device of the class described, the combination of an outer tubular member having a reduced bore at one end forming a shoulder; a valve in said member rotatable about an axis perpendicular to the axis of said tubular member and having a transverse cylindrical opening therein; an inner tubular member threaded to the outer member and having a cylindricalY extension nor mally positioned in the opening in said valve thereby preventing its rotation; a fusible plug in the inner end of said inner tubular member and normally against said shoulder; and a valve in the inner tubular member beyond the outer end of the outer member.

Signed by me at l P st Oiiice Sq., Boston, Mass., this 27 th day of November, 1914.

JOSEPH A. REGARD.

WYitnesses lVAL'rnn E. Loa/mann, NATHAN C. LOMBARD.

Commissioner of Patents,

Washington, D. C.

muws-ew. m 

